chat button sf

<script type='text/javascript' src='https://c.la5cs.salesforceliveagent.com/content/g/js/31.0/deployment.js'></script><script type='text/javascript'>
liveagent.init('https://d.la5cs.salesforceliveagent.com/chat', '572L00000008ONP', '00DL0000005rTtC');
</script>
<p><a class="online-link" href="javascript://Chat" id="liveagent_button_online_573L0000000Casm" onclick="liveagent.startChat('573L0000000Casm')" style="display: none;"><i class="fa fa-comment fa-3x">&nbsp;</i><span class="text">Chat With Us</span></a></p>

<div id="liveagent_button_offline_573L0000000Casm" style="display: none;"><a class="offline-link" href="/contact/contact.html"><i class="fa fa-comment fa-3x">&nbsp;</i><span class="text">Contact Us</span></a></div>
<script type="text/javascript">
if (!window._laq) { window._laq = []; }
window._laq.push(function(){liveagent.showWhenOnline('573L0000000Casm', document.getElementById('liveagent_button_online_573L0000000Casm'));
liveagent.showWhenOffline('573L0000000Casm', document.getElementById('liveagent_button_offline_573L0000000Casm'));
});</script>
<style type="text/css">#block-block-138 {
    position: fixed !important;
    box-shadow: none !important;
    bottom: 11px;
    right: 0;
    width: 82px !important;
    background: none !important;
    padding: 20px 0 20px 20px !important;
    z-index: 500;
    -webkit-transition: width 0.25s;
    transition: width 0.25s;
}
#block-block-138:hover{
    width: 225px !important;
}

#block-block-138 a.online-link,
a.offline-link{
    display: block;
    width: 190px;
    background: #1F91BC;
    text-shadow: 1px 1px rgba(255,255,255,0.2);
    text-transform: uppercase;
    padding: 15px 10px 15px 15px;
    font-size: 1.3em;
    text-decoration: none;
    color: white;
    text-shadow: -1px -1px rgba(0,0,0,0.3), 1px 1px rgba(255,255,255,0.3);
    margin-bottom:15px;
    margin-left:5px;
    height: 45px;
    line-height:45px;
}
#block-block-138 a.online-link,
a.offline-link{
  margin-left:0;
}
#block-block-138 a.online-link{
    background: #FEA204;
    color: #414042;
}
#block-block-138 a:active{
  background: rgb(255,214,94);
}
#block-block-138 a i.fa{
    margin-right: 1px;
    float: left;
    line-height: 1em;
    text-shadow: -1px -1px rgba(0,0,0,0.5), 1px 1px rgba(255,255,255,0.5);
    width:58px;
    vertical-align:middle;
}
#block-block-138 a span.text{
    display: block;
    overflow: hidden;
    vertical-align:middle;
}
#block-block-138 p{
 margin:0;
}
</style>
<script type="text/javascript">
liveagent.setChatWindowHeight(435);
liveagent.setChatWindowWidth(500);
</script>